Greetings again.
Still working on a date of transfer for Edward, but in the meantime I have found a Harry Spong in 6th London, where it appeared he remained.
Harry pair.jpg
Harry MIC.jpg
There are, as far as I can ascertain, no Harry Spong nor H Spong served with The RFA.
Also attached Ernest Medal index card.
The chap in the opening post could theoretically be either Harry or Ernest.
Ernest MIC.jpg
Regards.
Brian